Back from dig, strike kind of rock (4)
I believe the answer is:
glam
'kind of rock' is the definition.
(I've seen this in another clue)
'back from dig strike' is the wordplay.
'back from' says to take the final letters (the letter at the back of the word).
'strike' becomes 'lam' (to 'lam' means to hit hard).
The last letter of 'dig' is 'g'.
'g'+'lam'='GLAM'
(Other definitions for glam that I've seen before include "old Welsh county, in short" , "Woopie" , "dressed to attract?" , "Sort of rock" , "Alluring" .)